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Benefits Expected to be Paid from Plans Assets (Parenthetical) (Detail) - Includes Plan No 1 and No 2 Single Lump Sum - USD ($) $ in Millions | 12 Months Ended
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Dec. 30, 2017 | Dec. 31, 2016
Lump Sums Plan No. 1 |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Distributions from existing plan assets |  | $ 15.7
Lump Sums Plan No. 2 |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Distributions from existing plan assets |  | $ 1.6
Lump Sums Plan No. 1 |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Distributions from existing plan assets | $ 14.4 |
Lump Sums Plan No. 2 |  |
Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] |  |
Distributions from existing plan assets | $ 1.6 |

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- Definition Schedule of Pension and Other Postretirement Benefits Expected Benefit Payments [Line Items] + References No definition available. + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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